Question
$A \rightarrow B$
$B$
$\therefore A$

Answer

Combining the two bases of this argument as a whole, the argument will be as follows:
$(A \rightarrow B)\ \&\ B$
$\therefore A$
Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$
$A$ $B$ $A \rightarrow B$ $(A \rightarrow B) B$ $A$
$1$ $T$ $T$ $T$ $T$ $T$
$2$ $T$ $F$ $F$ $F$ $T$
$3$ $F$ $T$ $T$ $T^*$ $F^*$
$4$ $F$ $F$ $T$ $F$ $F^*$
  $1, 2 (\rightarrow)$ $3,2 (\&)$ As $1$
             
Judgment of the validity of the argument: A total of five columns have been formed in the above fact sheet. In which the column no. $4th$ base statement and column no. $5$ is the representation of the result statement, row by row out of the total four rows of the truth table. The base statement truth in $1$ and $4$ is $‘T’.$ But of the row. The resulting statement in $3$ is false $‘F’,$ hence this argument is disproportionate.

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